Educational program: DR.S. you're wrong!
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(C) 1997 Phantom Lord
Music by Shov
Greetings in the new section of our magazine.
The idea of establishing such a column appeared after
reading at the Kharkov ZX Power Journal
articles Likbez "where the author tries to convince novice
programmers" that throw 6144 bytes per tick
nevozmozhno.Vozmutilo me is that I get - "A beginning
programmer, because I believe that this can be done. The most
interesting thing that I did it! But everything is in order.
Thus, in the ZX Power # 1 painted all is well. Resulted in
several well-known methods:
1. POP HL
LD (ADR), HL
2. LD SP, STEK1
POP HL
...
LD SP, STEK
PUSH HL
....
Indeed, in such a way imprint
picture of one tick is impossible, but because
this is not the fastest ways to print!
I propose a counterexample for Authors ZX Power, and I hope
they will correct their error.
LD SP, # 5800
LD HL, # XXXX
PUSH HL
.... 3072 times
LD HL, # XXXX
PUSH HL
Now calculate:
LD SP, # 5800 - 1910 takts CPU
LD HL, # XXXX - 10 takts
PUSH HL - 11 takts
Total:
10 + (10 +11) * 3072 = 64522 cycles!
Of course, we can say that it was not
convenient first image thus placed among the medley, and LD HL
PUSH HL, but Why not do for the sake of speed! As you can see
all quite fit into one screen clock.
You can even hook up and the music that
were sold in the last part ETUDE
demo, published in the last issue of our magazine.
I beg you not to evaluate this material as the arrival on the
manufacturers ZX Power. All errors are the authors and are
likely to have its found without us. We can only add
a few words to address INFORKOM'a.
Probably seen in the ZX-REVIEW 1 / 2 for 1997.
So there is advertising ZX P. hello where lines from different
articles in the magazine. There where row and from literacy
classes, which once again shows that Inforkom continues to
write unverified information to the end. And yet
say that the Spectrum is held on Inforkome ... (But this is
probably already a topic of another conversation.)
And a bit of useful information.
I recently wrote introchku and slightly off the chair
did not fall when changing the 1950 RES 50-SET
files of mine was to slow down. After
small-scale experiments revealed that
Team RES XX, (HL) takes 15 cycles,
and somewhere 14-14.5! Maybe it depends on
the type of computer, but the fact that SCORP'e
so - it's a fact!
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